ectosarc

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The ectoplasm of certain protozoans, such as the amoeba.

Century Dictionary and Cyclopedia

1. n. The ectoplasm of a protozoan; the exterior substance of the body of an animal of low organization, as an amœba or other rhizopod or protozoan, in any way distinguished from an endosarc; the usually thicker, denser, tougher, or otherwise modified protoplasm which forms an envelop of the body, as differentiated from the interior substance or contents. The term is used chiefly in connection with amœbas or other rhizopods, in which, though there may be no definite cell-wall, the outer sarcode is differentiated in some way from the inner substance, or endosarc.

Wiktionary

1. n. The ectoplasm of an amoeba and similar protozoa

GNU Webster's 1913

1. n. (Biol.) The semisolid external layer of protoplasm in some unicellular organisms, as the amœba; ectoplasm; exoplasm.